Table ventilator



P 8, 1964 w. H. BRASKAMP TABLE VENTILATOR 2 Sheets-Sheet 1 Filed Feb. 7, 1962 INVENTOR ATTORNEY Sept. 8, 1954 w. H. BRASKAMP 3,147,639

TABLE VENTILATOR Filed Feb. 7, 1962 2 Sheets-Sheet 2 ATTORNEY United States Patent 3,147,639 TABLE VENTILATOR Willem Hendrik Braskamp, Voorhurg, Netherlands, assignor to N.V. Industriele Onderneming W. H. Braskarnp, Handelskade, Rijswijk, Netherlands, a corporation of Dutch law Filed Feb. 7, 1962, Ser. No. 171,660 Claims priority, application Netherlands Feb. 10, 1961 9 Claims. (Cl. 74-600) The present invention relates to table ventilators in which the easing of the ventilator is adapted to oscillate by means of the cooperation between an arm that is pivotally mounted on a fixed part of the ventilator and an eccentric, driven by the motor of the ventilator and engaging the other end of the arm, with an adjustable eccentricity.

It is an object of the present invention to furnish a construction for such a ventilator, which is also adapted to oscillate through different angles, but which is less expensive and more reliable in operation than heretofore known ventilators.

According to the invention this is achieved by the fact that to the part of the arm engaging the eccentric there is attached a resilient locking device engaging one of several openings in a driven disk, which locking device is guided in at least one slot rotating along with the power-driven disk. In this way it is ensured that the eccentricity and consequently the angle through which the ventilator oscillates are changed at intervals without any risk of slipping of the mechanism.

Further, according to the invention the resilient locking device may consist of a ball forced upwards by spring action. By this locking method the ventilator, while in operation, can be readily moved from one position to another without risk of damage. The adjustment of the eccentricity can be brought about by simply pushing against the casing of the ventilator until the ball engages another opening.

Furthermore, according to the invention the table ventilator may consist of two power-driven disks connected together in spaced relation. Star-shaped slots are provided in the first disc and a plurality of openings in register with the slots are provided in the second disc. The hollow pin with the spring and the ball, secured on the arm, has a diameter which is smaller than the width of the slots and has a flange with a diameter that is larger than the width of the slots, said flange fitting exactly between the two power-driven disks. In this way it is ensured that the spring-loaded ball cannot force the arm down, while the bearing for the arm on the fixed part of the ventilator can thus be made very much simpler. The star shape slots simplify the adjustment from the zero position.

The present invention will now be explained more fully with reference to the annexed drawing wherein:

FIG. 1 is a side elevation view of a table ventilator and wherein the structure corresponding to the pivoting movement of the casing is shown in cross-section,

FIG. 2 is a cross-sectional view on an enlarged scale of the pivoting mechanism of the ventilator shown in FIG. 2,

FIG. 3 is a bottom view of one of two power-driven disks,

FIG. 4 is a bottom view of another embodiment of the same disk, and

FIG. 5 is a bottom view of a second power-driven disk.

FIG. 1 illustrates a table ventilator with a base 1, a standard 2, and a casing 3. Supported in bearings in the rearmost part of the ventilator casing is a vertical shaft 4 driven by the motor of the ventilator, on which shaft is mounted a disk 5 having openings or cavities 6, which ice are engaged by a crank pin 7. This crank pin 7 is connected via an arm 8 with a bearing 9 fitted on a fixed part of the ventilator. The disk 5 has vertical edges 10. On these edges a second disk 11 is fastened in such a way that some distance between disks 5 and 11 are maintained in spaced relation. The discs may be secured in known manner by welding, brazing, rivets, bolts or the like. Thus the discs 5, 11 are secured for common rotation with shaft 4.

FIGS. 3 and 4 illustrate two embodiments of the disk 5; FIG. 3 showing a construction in which openings 6 have been made systematically, while FIG. 4 shows a construction in which the openings have the form of concentric grooves.

FIG. 5 is a view of the disk 11 wherein there is shown an embodiment in which six slots 12 have been made, which are in register with the openings 6 of the disk 5.

The large number of slots simplifies adjustment from the central position, since thus one does not have to fumble for the slot.

The crank pin 7 is constructed as a hollow member and at the upper end the pin 7 has a flange 13 fitting exactly between the two disks 5 and 11. In the bore of this crank pin 7 a spring 14 is present, which forces a ball 15 upwardly. The part of this crank pin 7 which projects outside the disk 11 is secured in a conventional way to the arm 8. When the position of the crank is to be changed, one merely has to push the casing aside by hand, as a result of which the crank pin 7 moves slidably in one of the slots 12 from one opening 6 to another. In the center of disc 5 is an opening that is concentric with the spindle 4.

What I claim is:

1. For a table ventilator having a fan driven by a motor and a casing supporting the fan and motor and adapted to pivot about a base, oscillating means for controlling in adjustable manner the pivotal movement of the casing about the base, said oscillating means comprising first and second discs rigidly coupled together in spaced facing relation, one of the disc-s being provided with a plurality of cavities facing the other disc, the other disc having a plurality of slots therein in registry with the cavities in the first said disc, means coupling the motor to the first said disc for rotating the first disc about a central axis thereof, a crank pin, and means pivotally connected to the base and supporting the crank pin for slidable movement in the slots in the second said disc, said crank pin extending towards said first disc for being accommodated in one of the cavities therein.

2. In an oscillating fan having a shaft driven by drive means, the provision of a first disc coaxially coupled to said shaft for rotation therewith, a second disc coupled to the first disc for rotation therewith and spaced from the first said disc in facing relation therewith, the first disc being provided with a plurality of cavities facing the second said disc, the second disc being provided with a plurality of slotted openings facing the first disc, the cavities in the first disc being in alignment with the slotted openings, a spring loaded crank pin, and means pivotally connected to the base and supporting the crank pin for slidable movement in the slotted openings of the second disc said crank pin extending towards the first disc for being engaged in one of the cavities therein to couple the first and second disc together for oscillatory movement of the disc about the crank pin, said crank pin being effective to vary the oscillation of the fan by changing the cavity in which the crank pin is engaged by causing relative sliding between the crank pin and the slotted openings in the second disc, said relative sliding being permissible while the shaft is being driven by the drive means.

' 3. A device for regulating the eccentricity of a pivotally supported crank pin of a table ventilator comprising a first element movably supported with respect to said crank pin and provided with slots for freely accommodating the crank pin, said crank pin being guided for movement in the slots, a second element including means for limiting movement of the first element in the direction of said slots and spring means for yielding and detachingly engaging the crank pin and the first said element together to limit movement of the first element relative to the crank pin in the direction of the slots.

4. For a table ventilator having a fan driven by a motor and a casing supporting the fan and motor for pivotal movement about a base, oscillating means for controlling in adjustable manner the pivotal movement of the casing about the base, said oscillating means comprising disc means having a central axis of rotation and coupled to the motor for being driven in rotation about said axis, a crank pin pivotally supported relative to said base, said disc means and crank pin being supported for relative movement with the crank pin slidable in the disc means, said disc means being provided with a plurality of cavities therein, said crank pin being engageable in said cavities one by one to provide diiferent eccentricities of the crank pin in the disc means, said disc means being adjustable relative to the crank pin to cause the latter to engage a selective one of disc means comprises first and second discs coupled together in spaced axial alignment for rotation about a common axis, one of said discs being provided with the cavities, the other disc being provided a plurality of slots in registry with the cavities, the crank pin being supported in the slots to permit relative sliding movement between the discs and the crank pin.

6. Oscillating means as claimed in claim 5 wherein said cavities are in the form of concentric circles and the slots radially extend from the axis of rotation.

7. Oscillating means as claimed in claim 5 wherein said cavities are individual cavities arranged along radially extending lines from the axis of rotation and said i slots are coextensive with said radially extending lines.

the cavities to vary the location of the crank pin rela- A UNITED STATES PATENTS 1,337,644 Dilg Apr. 20, 1920 2,838,956 Schneider June 17, 1958 2,934,973 Smith May 3, 1960 FOREIGN PATENTS 1,030,276 Germany May 22, 1958 

1. FOR A TABLE VENTILATOR HAVING A FAN DRIVEN BY A MOTOR AND A CASING SUPPORTING THE FAN AND MOTOR AND ADAPTED TO PIVOT ABOUT A BASE, OSCILLATTING MEANS FOR CONTROLLING IN ADJUSTABLE MANNER THE PIVOTAL MOVEMENT OF THE CASING ABOUT THE BASE, SAID OSCILLATING MEANS COMPRISING FIRST AND SECOND DISCS RIGIDLY COUPLED TOGETHER IN SPACED FACING RELATION, ONE OF THE DISCS BEING PROVIDED WITH A PLURALITY OF CAVITIES FACING THE OTHER DISC, THE OTHER DISC HAVING A PLURALITY OF SLOTS THEREIN IN REGISTRY WITH THE CAVITIES IN THE FIRST SAID DISC, MEANS COUPLING THE MOTOR TO THE FIRST SAID DISC FOR ROTATING THE FIRST DISC ABOUT A CENTRAL AXIS THEREOF, A CRANK PIN, AND MEANS PIVOTALLY CONNECTED TO THE BASE AND SUPPORTING THE CRANK PIN FOR SLIDABLE MOVEMENT IN THE SLOTS IN THE SECOND SAID DISC, SAID 